Zantedeschia aethiopica White Powder - Causes & Fixes

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Powdery Mildew

A fungal disease caused by Oomycetes or Ascomycetes that thrives in high humidity and poor air circulation around the large Calla Lily leaves. It presents as a distinct white, flour-like coating on the leaf surfaces.

Very Common

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How to confirm: Inspect the undersides of the leaves to see if the white patches are spreading or if there is fuzzy mycelium present.

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1 Apply an organic fungicide to the affected leaves to eliminate the fungal spores and prevent further spread.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

2 Prune and dispose of any heavily infected leaves to reduce the fungal load in the plant's environment.

3 Improve air circulation around the plant and reduce humidity by avoiding overhead watering on the foliage.

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Mealybugs

Small, soft-bodied insects that secrete a white, waxy, cottony substance to protect themselves. They tend to cluster in the leaf axils and under the large spathes of the Zantedeschia.

Common

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How to confirm: Use a magnifying glass to check for tiny, moving insects nestled in the crevices where the leaves meet the stem.

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1 Isolate the plant immediately to prevent the mealybugs from spreading to other indoor greenery.

2 Treat the infestation by spraying the plant with an organic insecticide to eliminate the soft-bodied insects and their waxy coating.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

3 Gently wipe away visible white cottony clusters from the leaf axils and spathes using a cotton swab dipped in isopropyl alcohol.

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Mineral Deposits (Hard Water)

Calcium or magnesium carbonates from tap water can dry on the surface of the large, smooth leaves after misting or heavy watering. This creates a crusty, white, inorganic residue rather than a biological growth.

Common

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How to confirm: Try wiping a small area with a cloth soaked in distilled water; if it dissolves easily, it is mineral buildup.

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1 Gently wipe the leaves with a soft, damp cloth to remove the mineral crust without damaging the foliage.

2 Switch to using distilled water, rainwater, or filtered water for misting and watering to prevent new calcium and magnesium buildup.

3 Monitor soil moisture levels to ensure you aren't overwatering, which can exacerbate mineral accumulation in the substrate.

GROWIT Soil Moisture Meter - Teal

Water Meters

$12

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Botrytis Blight (Early Stage)

While typically causing rot, the early stages of Botrytis can appear as light-colored, grayish-white fuzzy patches on the petal-like spathe or leaf margins in damp conditions.

Common

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How to confirm: Check if the white patches are accompanied by soft, decaying tissue or dark brown spots on the flower spike.

build How to fix it

shopping_cart Recommended Products

1 Remove and discard all infected leaves and spathes immediately to prevent the fungal spores from spreading to healthy plant tissue.

2 Apply an organic fungicide to the affected areas to control the spread of the blight.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

3 Improve air circulation around the plant and reduce humidity by avoiding overhead watering, ensuring the soil surface dries between waterings.